Can't connect to my iCloud Mail Account with the Mail.app OSX

Hello,

i have a problem with my mail.app on my macbook air. i reinstall the osx on the macbook air, current it works with mavericks. and after that i cant connect to my icloud mail account, but it still works with my other devices (iphone5 and on icloud.com).

an errormessage appeared on my display after trying to connect.

sorry for my english, i hope you understand my problem and so we can solve it, hopefully. 🙂